Shutter device

Abstract

To provide a shutter device capable of improving the safety of evacuees.SOLUTION: This shutter device includes a shutter which descends to a first descended position upon detection of a fire outbreak, and descends to a second descended position that is lower than the first descended position upon establishment of a specified change condition. A first evacuation guidance display, which indicates a possibility of passage under the shutter, takes a first state visible to evacuees when the shutter descends to the first descended position, and changes to a second state, which is less visible to the evacuees in comparison with the first state, when the shutter descends to the second descended position.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a shutter device. [Background technology]

[0002] Conventionally, as shown in Patent Document 1, for example, a shutter device has been disclosed in which the shutter descends in the event of a fire. In such a shutter device, a fire indicator that changes color in response to the heat of a fire is formed on the shutter surface. This allows the occurrence of a fire to be recognized reliably.

[0003] Furthermore, among such shutter devices, there is known a type in which the shutter descends in multiple stages. Specifically, when a fire is detected, the shutter descends to a first descending position to allow evacuees to pass underneath the shutter, and when a predetermined change condition is met, the shutter descends to a second descending position, which is lower than the first descending position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-234878 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with such shutter devices, even if the shutter is lowered to the first lowered position so that evacuees can pass under the shutter, it is up to the evacuees to decide whether or not to pass under the shutter. As a result, there have been cases where evacuees have not passed under the shutter. Thus, there is a need to improve the safety of evacuees. [Means for solving the problem]

[0006] A shutter device that solves the above problem comprises a shutter that descends to a first descending position upon detection of a fire outbreak, and descends to a second descending position that is lower than the first descending position when a predetermined change condition is met, and a first evacuation guidance display indicating that it is possible to pass under the shutter is in a first state that is visible to evacuees when the shutter descends to the first descending position, and changes to a second state that is more difficult for evacuees to see than the first state when the shutter descends to the second descending position. [Effects of the Invention]

[0007] According to the present invention, the safety of evacuees can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a shutter device according to a first embodiment. [Figure 2] 2(A) and 2(B) are explanatory diagrams showing the shutter device of the first embodiment. [Figure 3] 3(A) and 3(B) are front views showing the shutter device of the first embodiment. [Figure 4] FIG. 4 is a flowchart showing the shutter lowering process of the first embodiment. [Figure 5] FIG. 5 is a timing chart showing state transitions of the shutter device of the first embodiment. [Figure 6] 6(A) and 6(B) are explanatory diagrams showing a shutter device according to a second embodiment. [Figure 7] 7(A) and 7(B) are front views showing a shutter device according to the second embodiment. [Figure 8] FIG. 8 is a timing chart showing state transitions of the shutter device of the second embodiment. [Figure 9] FIG. 9(A) is an explanatory diagram showing a shutter device of a third embodiment, and FIG. 9(B) is an explanatory diagram showing a shutter device of a modified example. [Figure 10]FIG. 10 is a flowchart showing the shutter lowering process of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] An embodiment of the shutter device will now be described. <Shutter device 10> As shown in Figure 1, the shutter device 10 is configured to be able to divide a space 90 within a building into a first space 90A and a second space 90B. The shutter device 10 is a shutter device that can be moved up and down. The shutter device 10 is a shutter device that can be lowered in two stages.

[0010] The shutter device 10 includes a shutter 11. The shutter 11 is configured with a plurality of panel materials connected together. The shutter 11 can be raised and lowered. The shutter 11 may be a fire shutter that has the ability to block the spread of fire.

[0011] The shutter 11 has a shutter surface 12. The shutter surface 12 is a surface that divides the space 90 into a first space 90A and a second space 90B when the shutter 11 descends. In this embodiment, to facilitate understanding of the invention, the shutter surface 12 is the surface on the first space 90A side.

[0012] The space 90 is formed by a floor 91, a ceiling 92, and a wall 93. The space 90 may be located, for example, in a subway station or a commercial facility. The wall 93 may have the ability to block the spread of fire. A pair of guide rails 94 is provided on the wall 93. The pair of guide rails 94 extends in the vertical direction. The pair of guide rails 94 guide the shutter 11 as it moves up and down.

[0013] An emergency door 95 is provided on the wall 93. The emergency door 95 is provided on one side of the shutter device 10, but may be provided on both sides of the shutter device 10. The emergency door 95 can be opened and closed by evacuees, and has a passageway through which evacuees can evacuate. Even if the shutter 11 descends to the floor 91, evacuees can evacuate through the emergency door 95. The emergency door 95 may be narrower than the shutter 11 of the shutter device 10. For this reason, it is preferable that the passageway that can be partitioned by the shutter 11 is wider than the passageway that is opened and closed by the emergency door 95, and that evacuees use it to evacuate.

[0014] The shutter 11 can be wound around a winding shaft 15 in the storage area 14 through the opening 13. The opening 13 is provided in the ceiling 92. The storage area 14 is provided above the ceiling 92, but may also be provided below the ceiling 92. The winding shaft 15 extends along the width direction of the shutter 11.

[0015] The shutter device 10 can transition between a housed state and a partitioned state. The housed state is a state in which the shutter 11 is housed in the housing area 14. The partitioned state is a state in which the shutter 11 is lowered from the housing area 14.

[0016] The shutter device 10 transitions from the storage state to the partition state as the shutters 11 stored in the storage area 14 move in order to the space 90. The shutter device 10 transitions from the partition state to the storage state as the shutters 11 arranged in the space 90 move in order to the storage area 14.

[0017] The shutter device 10 includes a control unit 20, an operation unit 21, an elevation drive unit 22, a first fire detection unit 23, and a second fire detection unit 24. The control unit 20 controls the shutter device 10. The control unit 20 is mainly configured with a microcontroller. The microcontroller may have, for example, a processor, memory, input interface, and output interface connected to one another via a bus. The control unit 20 transmits a drive signal to the operation unit 21. The control unit 20 receives detection signals from the first fire detection unit 23 and the second fire detection unit 24.

[0018] The operation unit 21 can be operated by an operator. The operation unit 21 may perform at least one of automatic operation and manual operation. The automatic operation is an operation of raising and lowering the shutter 11 by driving the elevation drive unit 22. The manual operation is an operation of raising and lowering the shutter 11 without driving the elevation drive unit 22. The operation unit 21 controls the elevation drive unit 22 based on a drive signal from the control unit 20.

[0019] The lifting / lowering drive unit 22 is a drive source that raises and lowers the shutter 11. The lifting / lowering drive unit 22 may be, for example, a motor. The lifting / lowering drive unit 22 may be provided inside the wall 93 or above the ceiling 92. The shutter 11 is configured to descend by its own weight when power supply to the shutter device 10 is cut off.

[0020] The first fire detection unit 23 and the second fire detection unit 24 are provided in the first space 90A. The first fire detection unit 23 is a sensor that detects the occurrence of a fire. Specifically, the first fire detection unit 23 may be a sensor that detects the occurrence of smoke. The second fire detection unit 24 is a sensor that detects a predetermined temperature. The timing at which the second fire detection unit 24 detects the predetermined temperature is later than the timing at which the first fire detection unit 23 detects the occurrence of smoke.

[0021] <Shutter 11 lowered position> Here, the lowered position of the shutter 11 will be described with reference to FIG. 2(A), when a fire breaks out in the first space 90A and the first fire detection unit 23 detects the fire, the shutter 11 descends from the original position to the first descended position P11. The original position is the position where the shutter 11 is stored.

[0022] The first lowered position P11 is a position where the shutter 11 is in a partition state, and is a position where the shutter 11 is lowered to a first height h1. The first height h1 is lower than the height h0 from the floor 91 to the ceiling 92. The first height h1 is a height that allows evacuees to pass under the shutter 11 while preventing the spread of smoke.

[0023] As a specific example, when the height h0 is 3.0 m, the first height h1 may be 1.8 m to 2.0 m. In this way, even when the shutter 11 is lowered to the first lowered position P11, evacuees can pass under the shutter 11.

[0024] 2(B), when the second fire detection unit 24 detects that the temperature has risen to a predetermined temperature, the shutter 11 descends from the first descending position P11 to the second descending position P12. In this embodiment, the temperature rising to the predetermined temperature corresponds to an example of a predetermined change condition.

[0025] The second lowered position P12 is a position where the shutter 11 is in a partition state, and is a position lower than the first lowered position P11. The second lowered position P12 is a position where the shutter 11 has lowered to the floor 91. The second lowered position P12 is at a height where evacuees cannot pass under the shutter 11.

[0026] In this way, when the shutter 11 descends to the second descending position P12, evacuees cannot pass under the shutter 11. Also, it is better for evacuees not to pass under the shutter 11 while the shutter 11 is descending from the first descending position P11 to the second descending position P12.

[0027] <Evacuation guidance display> Next, the evacuation guidance display provided on the shutter 11 will be described with reference to FIG. As shown in Fig. 3, the shutter 11 is provided with a first evacuation guidance sign 31. The first evacuation guidance sign 31 is provided on the first shutter face 12A of the shutter face 12. The first shutter face 12A is located below the shutter face 12. The first shutter face 12A is the face of the shutter face 12 that is exposed when the shutter 11 descends to the first descended position P11. In other words, the first evacuation guidance sign 31 is provided on the first shutter face 12A of the shutter face 12 that is exposed when the shutter 11 descends to the first descended position P11.

[0028] The first evacuation guidance sign 31 is a sign indicating that it is possible to pass under the shutter 11. As a specific example, the first evacuation guidance sign 31 may include the phrase "Stop 2 m above your head." The first evacuation guidance sign 31 may include the phrase "Pass through below." The first evacuation guidance sign 31 may include an image indicating the evacuation direction in which evacuees should evacuate.

[0029] The shutter 11 is provided with a second evacuation guidance sign 32. The second evacuation guidance sign 32 is provided on the second shutter surface 12B of the shutter surface 12. The second shutter surface 12B is located higher than the first shutter surface 12A.

[0030] The second evacuation guidance sign 32 is a sign indicating that it is not possible to pass under the shutter 11. As a specific example, the second evacuation guidance sign 32 may include the words "Shutter descending." The second evacuation guidance sign 32 may include the words "No passage through the lower part." The second evacuation guidance sign 32 may include the words "Go through the door on the left."

[0031] The first evacuation guidance sign 31 and the second evacuation guidance sign 32 may be green to improve visibility. The second evacuation guidance sign 32 is preferably sized to be visible at a viewing distance of 20 m, and the Japanese characters may be 80 mm or more in height, and the English characters may be 60 mm or more in height.

[0032] The first evacuation guidance sign 31 and the second evacuation guidance sign 32 are designed to reversibly change color when heated. Thermochromism is used for the first evacuation guidance sign 31 and the second evacuation guidance sign 32.

[0033] In particular, when the temperature of the first evacuation guidance sign 31 rises to the color-changing temperature, it changes from the first state shown in Fig. 3(A) to the second state shown in Fig. 3(B). As shown in Fig. 3(A), the first state is a state that can be seen by evacuees. As shown in Fig. 3(B), the second state is a state that is more difficult for evacuees to see than the first state, and may even be a state that cannot be seen by evacuees.

[0034] When the temperature of the second evacuation guidance sign 32 rises to the color-changing temperature, the second evacuation guidance sign 32 changes from the third state shown in Fig. 3(A) to the fourth state shown in Fig. 3(B). As shown in Fig. 3(A), the third state is a state in which evacuees cannot see the sign. As shown in Fig. 3(B), the fourth state is a state in which evacuees can see the sign. In other words, the third state is a state in which evacuees cannot see the sign as compared to the fourth state.

[0035] The discoloration temperature is the same as the predetermined temperature, but may be any temperature within a predetermined temperature range including the predetermined temperature. The predetermined temperature range may have a lower limit temperature that is the temperature a first predetermined time before the temperature rises to the predetermined temperature. The first predetermined time is preferably a time that takes into account the error in timing of detecting that the temperature has risen to the predetermined temperature. In this way, the discoloration temperature may be a temperature equal to or lower than the predetermined temperature. The predetermined temperature range may have an upper limit temperature that is the temperature a second predetermined time after the temperature has risen to the predetermined temperature. The second predetermined time is preferably equal to or lower than the time it takes the shutter 11 to descend from the first descending position P11 to the second descending position P12. In this way, the discoloration temperature may be a temperature equal to or higher than the predetermined temperature.

[0036] The first evacuation guidance sign 31 remains colored until the temperature rises to the color-changing temperature, at which point it turns colorless. In this way, the first evacuation guidance sign 31 changes from the first aspect to the second aspect when the temperature rises to the color-changing temperature.

[0037] The second evacuation guidance sign 32 is colorless until the temperature rises to the color-changing temperature, at which point it turns colored. In this way, the second evacuation guidance sign 32 changes from the third aspect to the fourth aspect when the temperature rises to the color-changing temperature.

[0038] <Shutter lowering process> Next, the shutter lowering process will be described with reference to Fig. 4. The shutter lowering process is a process executed by the control unit 20 at predetermined intervals.

[0039] 4, in step S10, the control unit 20 determines whether or not a fire has been detected based on the detection signal from the first fire detection unit 23. If the control unit 20 determines that a fire has not been detected, the control unit 20 proceeds to step S12. If the control unit 20 determines that a fire has been detected, the control unit 20 proceeds to step S11.

[0040] In step S11, the control unit 20 executes a first lowered position control process. In this process, the control unit 20 controls the lifting / lowering drive unit 22 to move the shutter 11 from the original position to the first lowered position P11. As a result, the shutter 11 descends to the first lowered position P11 upon detection of a fire.

[0041] In step S12, the control unit 20 determines whether or not it has detected that the temperature has risen to a predetermined temperature based on the detection signal from the second fire detection unit 24. If the control unit 20 determines that it has not detected that the temperature has risen to the predetermined temperature, it ends the shutter lowering process. If the control unit 20 determines that it has detected that the temperature has risen to the predetermined temperature, it proceeds to step S13.

[0042] In step S13, the control unit 20 executes a second lowered position control process. In this process, the control unit 20 controls the elevation drive unit 22 to move the shutter 11 from the first lowered position P11 to the second lowered position P12. As a result, the shutter 11 lowers from the first lowered position P11 to the second lowered position P12 when a predetermined temperature is reached. In other words, the shutter 11 lowers from the first lowered position P11 to the second lowered position P12 when a predetermined change condition is met.

[0043] <Operation of the First Embodiment> The operation of the first embodiment will be described. 5, when no fire is detected based on the detection signals from the first fire detection unit 23 and the second fire detection unit 24, the shutter 11 is placed in its original position and is in a stored state. Therefore, the first evacuation guidance sign 31 provided on the first shutter surface 12A and the second evacuation guidance sign 32 provided on the second shutter surface 12B are not visible.

[0044] At the timing indicated by the symbol T10, when a fire is detected based on the detection signal from the first fire detection unit 23, the shutter 11 starts to descend from the original position to the first descended position P11. In this case, no rise in the predetermined temperature is detected based on the detection signal from the second fire detection unit 24.

[0045] When the shutter 11 descends to the first lowered position P11 at the timing indicated by reference symbol T11, the first evacuation guidance sign 31 provided on the first shutter surface 12A is in a first state visible to evacuees because the temperature has not yet risen to the predetermined temperature. In other words, the first evacuation guidance sign 31 is in the first state when the shutter 11 descends to the first lowered position P11. Note that at a timing prior to the timing indicated by reference symbol T11, the first evacuation guidance sign 31 is in the first state visible to evacuees in response to the descent of the shutter 11 to the first lowered position P11.

[0046] On the other hand, the second evacuation guidance sign 32 provided on the second shutter surface 12B is in the third state, which is invisible to evacuees, because the temperature has not yet risen to the predetermined temperature. In other words, the second evacuation guidance sign 32 is in the third state when the shutter 11 descends to the first descending position P11.

[0047] At the timing indicated by symbol T12, when it is detected that the temperature has risen to a predetermined temperature based on the detection signal from the second fire detection unit 24, the shutter 11 begins to descend from the first descending position P11 to the second descending position P12.

[0048] In this case, the first evacuation guidance display 31 changes to the second mode in which evacuees cannot see it because the temperature has risen to the predetermined temperature. In other words, the first evacuation guidance display 31 is in the second mode when the predetermined change condition is met.

[0049] On the other hand, since the temperature of the second evacuation guidance display 32 has risen to the predetermined temperature, the second evacuation guidance display 32 changes to a fourth state that is visible to evacuees. That is, the second evacuation guidance display 32 is in the fourth state when the predetermined change condition is met.

[0050] Then, at the timing indicated by the reference symbol T13, the shutter 11 descends to the second descended position P12. In this way, the first evacuation guidance display 31 has changed to the second aspect when the shutter 11 descends to the second descended position P12. The second evacuation guidance display 32 has changed to the fourth aspect when the shutter 11 descends to the second descended position P12.

[0051] <Effects of the first embodiment> The effects of the first embodiment will be described. (1-1) The shutter 11 descends to the first descended position P11 upon detection of a fire outbreak, and descends to the second descended position P12 when a predetermined temperature is reached as a predetermined change condition. The first evacuation guidance display 31 is a display indicating that it is possible to pass underneath the shutter 11. When the temperature of the first evacuation guidance display 31 rises to a color-changing temperature, the first evacuation guidance display 31 changes from a first state in which evacuees can be seen to a second state in which evacuees cannot be seen. Therefore, when the shutter 11 descends to the first descended position P11, evacuees can determine from the first state of the first evacuation guidance display 31 that they can pass underneath the shutter 11. This increases the likelihood that evacuees will pass underneath the shutter 11 and evacuate, thereby shortening the evacuation time. Therefore, the safety of evacuees can be improved.

[0052] In addition, when the shutter 11 descends from the first descending position P11 to the second descending position P12, the first evacuation guidance display 31, which has changed to the second mode, can increase the possibility that evacuees will evacuate without passing under the shutter 11. Therefore, the safety of evacuees can be improved.

[0053] (1-2) The second evacuation guidance sign 32 is a sign indicating that it is not possible to pass under the shutter 11. When the temperature of the second evacuation guidance sign 32 rises to the color-changing temperature, it changes from a third state in which evacuees are not visible to a fourth state in which evacuees are visible. Therefore, when the shutter 11 descends to the first descending position P11, the second evacuation guidance sign 32 in the third state increases the possibility that evacuees will pass under the shutter 11 and evacuate, thereby shortening the evacuation time. Therefore, the safety of evacuees can be improved.

[0054] In addition, when the shutter 11 descends from the first descending position P11 to the second descending position P12, the second evacuation guidance display 32, which has changed to the fourth mode, enables the evacuees to determine that they cannot pass under the shutter 11. This increases the possibility that the evacuees will be able to evacuate without passing under the shutter 11. This improves the safety of the evacuees.

[0055] (1-3) The first evacuation guidance sign 31 changes from the first state to the second state when the temperature rises to the color-changing temperature. Therefore, without any manual operation, it is possible to increase the possibility that evacuees will be able to evacuate from the first evacuation guidance sign 31 that has changed to the second state without passing under the shutter 11. This improves the safety of evacuees.

[0056] (1-4) The first evacuation guidance sign 31 is provided on the first shutter surface 12A of the shutter surface 12, which is exposed when the shutter 11 descends to the first descended position P11. Therefore, the first state of the first evacuation guidance sign 31 becomes visible as the shutter 11 descends to the first descended position P11. This improves the visibility of the first evacuation guidance sign 31 while increasing the likelihood that evacuees will evacuate by passing under the shutter 11, thereby shortening the evacuation time. This improves the safety of evacuees. Furthermore, the design before a fire occurs is not diminished.

[0057] (1-5) The first evacuation guidance display 31 includes the evacuation direction. Therefore, the first evacuation guidance display 31 in the first mode not only indicates that the evacuees will pass under the shutter 11, but also allows the evacuees to determine the evacuation direction. This improves the safety of the evacuees.

[0058] [Second embodiment] Next, a second embodiment will be described. In the following description, the same configuration as in the already described embodiment will be omitted or simplified, and the configuration different from the already described embodiment will be mainly described.

[0059] As shown in Figures 6(A) and 6(B), in the second embodiment, the shutter device 10 includes a displacement member 40. The displacement member 40 is attached to the shutter surface 12. In other words, the shutter 11 includes the displacement member 40. Note that in Figure 6, the first evacuation guidance sign 31, the second evacuation guidance sign 32, and the displacement member 40 are shown with a thickness to make the invention easier to understand.

[0060] The displacement member 40 is a flexible member that can be wound up around the winding shaft 15 together with the shutter 11. The displacement member 40 may be a sheet member. The displacement member 40 is preferably made of a material that has fireproof or flame-retardant properties. The displacement member 40 may be narrower than the width of the shutter 11. In this way, by arranging the displacement member 40, the shutter 11 is not entirely hidden, and the presence of the shutter 11 can be recognized by evacuees.

[0061] The displacement member 40 has a first surface 41 and a second surface 42. The second surface 42 is the reverse surface of the first surface 41. The second evacuation guidance sign 32 is provided on the second surface 42. The displacement member 40 has a base end portion 43 and a tip end portion 44. The base end portion 43 is attached above the first shutter surface 12A. The displacement member 40 is accommodated in the accommodation area 14 together with the shutter 11 when the shutter 11 is in the accommodated state.

[0062] 6(A), when the shutter 11 descends from the original position to the first descended position P11, the displacement member 40 is positioned from the original position (not shown) to the first displacement position P21. The original position is a position where the displacement member 40 is wound around the take-up shaft 15 together with the shutter 11. When the displacement member 40 is positioned at the original position, the displacement member 40 is positioned outside the shutter 11 and is wound around the take-up shaft 15 together with the shutter 11. When the displacement member 40 is positioned at the original position, the tip portion 44 is clamped between the shutters 11.

[0063] The first displacement position P21 is a position where the tip portion 44 abuts against the inner wall 14A, thereby being disposed in the storage area 14. The inner wall 14A is a wall that partitions the storage area 14. In this way, when the displacement member 40 is disposed at the first displacement position P21 from the original position, the tip portion 44 detaches from the shutter 11 and abuts against the inner wall 14A, thereby being disposed in the storage area 14. The first displacement position P21 is a position where the second surface 42 is not visible.

[0064] As shown in Figures 6(A) and 7(A), when the displacement member 40 is placed at the first displacement position P21, the first evacuation guidance sign 31 provided on the first shutter surface 12A is not hidden by the displacement member 40 but is exposed. As a result, the first evacuation guidance sign 31 is in a first state that is visible to evacuees. Furthermore, the second surface 42 is not exposed. As a result, the second evacuation guidance sign 32 provided on the second surface 42 is in a third state that is not visible to evacuees.

[0065] 6(B), when the shutter 11 starts to descend from the first descending position P11 to the second descending position P12, the tip end 44 does not abut the inner wall 14A, and the displacement member 40 turns over and displaces to the second displacement position P22. The second displacement position P22 is a position where the tip end 44 faces downward. The second displacement position P22 is a position where the second surface 42 is visible.

[0066] As shown in Figures 6(B) and 7(B), when the displacement member 40 is displaced from the first displacement position P21 to the second displacement position P22, the first evacuation guidance sign 31 provided on the first shutter surface 12A is hidden by the displacement member 40. As a result, the first evacuation guidance sign 31 is in a second state in which it is not visible to evacuees. In addition, the second surface 42 is exposed. As a result, the second evacuation guidance sign 32 provided on the second surface 42 is in a fourth state in which it is visible to evacuees.

[0067] In this way, the displacement member 40 is displaced from the first displacement position P21 to the second displacement position P22 in response to the descent of the shutter 11 from the first descent position P11. As a result, when the temperature rises to a predetermined temperature as a predetermined change condition, the first evacuation guidance sign 31 changes from the first position to the second position due to the displacement of the displacement member 40. Also, when the temperature rises to a predetermined temperature as a predetermined change condition, the second evacuation guidance sign 32 changes from the third position to the fourth position due to the displacement of the displacement member 40.

[0068] <Operation of the Second Embodiment> The operation of the second embodiment will be described. 8, when the shutter 11 descends to the first descended position P11 at the timing indicated by the symbol T11, the displacement member 40 is disposed at the first displacement position P21, and therefore the first evacuation guidance sign 31 is in the first state that is visible to evacuees. In other words, the first evacuation guidance sign 31 is in the first state when the shutter 11 descends to the first descended position P11.

[0069] On the other hand, the second evacuation guidance sign 32 provided on the second surface 42 is in a third position that is not visible to evacuees because the displacement member 40 is disposed at the first displacement position P21. In other words, the second evacuation guidance sign 32 is in the third position when the shutter 11 descends to the first descended position P11.

[0070] At the timing indicated by reference symbol T12, when it is detected that the temperature has risen to a predetermined temperature based on the detection signal from the second fire detection unit 24, the shutter 11 starts to descend from the first descended position P11 to the second descended position P12. As a result, the displacement member 40 is displaced from the first displacement position P21 to the second displacement position P22.

[0071] In this case, the first evacuation guidance sign 31 is hidden by the displacement member 40 and changes to the second state in which it is not visible to evacuees. In other words, the first evacuation guidance sign 31 is in the second state when a predetermined change condition is met.

[0072] On the other hand, the second evacuation guidance display 32 changes to a fourth state that is visible to evacuees when the second surface 42 is exposed. That is, the second evacuation guidance display 32 is in the fourth state when a predetermined change condition is met.

[0073] <Actions and Effects of the Second Embodiment> The operation and effects of the second embodiment will be described. (2-1) The first evacuation guidance sign 31 changes from the first state to the second state by the displacement of the displacement member 40. Therefore, the first evacuation guidance sign 31 can be changed from the first state to the second state by the physical displacement of the displacement member 40.

[0074] (2-2) As the shutter 11 descends from the first descended position P11 to the second descended position P12, the displacement member 40 itself is displaced. Therefore, by displacing the displacement member 40 without using a power source, the first evacuation guidance display 31 can be changed from the first state to the second state.

[0075] (2-3) The second evacuation guidance sign 32 changes from the third state to the fourth state by the displacement of the displacement member 40. Therefore, the second evacuation guidance sign 32 can be changed from the third state to the fourth state by the physical displacement of the displacement member 40.

[0076] (2-4) As the shutter 11 descends from the first descended position P11 to the second descended position P12, the displacement member 40 itself is displaced. Therefore, by displacing the displacement member 40 without using a power source, the second evacuation guidance display 32 can be changed from the third state to the fourth state.

[0077] [Third embodiment] Next, a third embodiment will be described. 9(A), in the third embodiment, the second evacuation guidance sign 32 may be provided on the second shutter surface 12B of the shutter surface 12. When the shutter 11 descends to the first descending position P11 and the displacement member 40 is positioned at the first displacement position P21, the second evacuation guidance sign 32 is hidden by the displacement member 40, and is thus in a third state in which it cannot be seen by evacuees.

[0078] When the shutter 11 starts to descend from the first descending position P11 to the second descending position P12, the displacement member 40 is displaced from the first displacement position P21 to the second displacement position P22. As a result, the second evacuation guidance display 32 is no longer hidden by the displacement member 40 but is exposed, and changes to a fourth state that is visible to evacuees.

[0079] [Fourth embodiment] Next, a fourth embodiment will be described. 9, in the fourth embodiment, the shutter device 10 may be a shutter device that can be lowered in three or more stages. As a specific example, the shutter device 10 may be capable of descending from a first lowered position P11 to a second lowered position, and from the second lowered position to a third lowered position.

[0080] The second descending position is a position lower than the first descending position P11, and is at a height at which evacuees can pass under the shutter 11. The third descending position is a position lower than the second descending position, and is at a height at which evacuees cannot pass under the shutter 11, and is a position at which the shutter 11 has descended to the floor 91.

[0081] As a specific example, the first lowered position may be a position where the shutter 11 is lowered to a height of 2.0 m above the floor 91. The second lowered position may be a position where the shutter 11 is lowered to a height of 1.8 m above the floor 91.

[0082] <Shutter lowering process> 10, in step S12 of the shutter lowering process, if the control unit 20 determines that a rise to the predetermined temperature has not been detected, the control unit 20 proceeds to step S14. In step S13 of the shutter lowering process, the control unit 20 proceeds to step S14 after completing the second lowering position control process.

[0083] In step S14, the control unit 20 determines whether a predetermined time has elapsed since the shutter 11 was placed in the second lowered position. If the control unit 20 determines that the predetermined time has not elapsed since the shutter 11 was placed in the second lowered position, the control unit 20 ends the shutter lowering process. If the control unit 20 determines that the predetermined time has elapsed since the shutter 11 was placed in the second lowered position, the control unit 20 proceeds to step S15.

[0084] In step S15, the control unit 20 executes a third lowered position control process. In this process, the control unit 20 controls the elevation drive unit 22 to move the shutter 11 to the third lowered position. As a result, the shutter 11 descends from the first lowered position P11 to the second lowered position when a predetermined temperature is reached, and when a predetermined time has elapsed after descending to the second lowered position, the shutter 11 starts descending from the second lowered position to the third lowered position.

[0085] In this way, when the shutter 11 descends to the second descending position where evacuees can pass underneath the shutter 11, after a predetermined time has elapsed, it descends to the third descending position where evacuees cannot pass underneath the shutter 11. Therefore, when the shutter 11 descends to the second descending position, the state where evacuees can pass underneath the shutter 11 is maintained, but the first evacuation guidance display 31 has changed to the second state and the second evacuation guidance display 32 has changed to the fourth state.

[0086] [Example of change] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0087] In the first embodiment, the second mode may be such that the evacuees are more difficult to see than the first mode, for example, by a lighter color, and the third mode may be such that the evacuees are more difficult to see than the fourth mode, for example, by a lighter color, and the third mode may be such that the evacuees are more difficult to see than the fourth mode, for example, by a lighter color.

[0088] In the first embodiment, the first evacuation guidance sign 31 and the second evacuation guidance sign 32 do not have to become colorless. As a specific example, the first evacuation guidance sign 31 may be a different color from the shutter surface 12 until the temperature rises to the color-change temperature, but may change to the same color as the shutter surface 12 once the temperature rises to the color-change temperature. The second evacuation guidance sign 32 may be the same color as the shutter surface 12 until the temperature rises to the color-change temperature, but may change to a color different from the shutter surface 12 once the temperature rises to the color-change temperature.

[0089] In the second and third embodiments, the displacement member 40 may be adhered to the shutter 11. Specifically, the second surface 42 may be adhered to the shutter 11. The tip portion 44 may be adhered to the shutter 11. In this case, when the temperature rises to a predetermined temperature, the displacement member 40 may be peeled off from the shutter 11 in accordance with the temperature, thereby displacing the displacement member 40 from the first displacement position P21 to the second displacement position P22.

[0090] In the second and third embodiments, the displacement member 40 may be fixed to the shutter 11 with wax. Specifically, the second surface 42 may be fixed to the shutter 11 with wax. The tip portion 44 may be fixed to the shutter 11 with wax. In this case, when the temperature rises to a predetermined temperature, the wax melts and the displacement member 40 peels off from the shutter 11, so that the displacement member 40 may be displaced from the first displacement position P21 to the second displacement position P22.

[0091] In the second and third embodiments, the displacement member 40 may be attached to the shutter 11 by magnetic force. Specifically, the second surface 42 may be attached to the shutter 11 by a magnet. The tip portion 44 may be attached to the shutter 11 by magnetic force. In this case, when the temperature rises to a predetermined temperature, the magnetic force between the displacement member 40 and the shutter 11 may weaken in accordance with the temperature, causing the displacement member 40 to be displaced from the first displacement position P21 to the second displacement position P22.

[0092] In the second and third embodiments, the predetermined change condition may include operation of the operating unit 21. Alternatively, the predetermined change condition may be met when a predetermined time has elapsed since the shutter 11 descended to the first descended position P11. In this case, regardless of whether the temperature has risen to a predetermined temperature, the displacement member 40 is displaced from the first displacement position P21 to the second displacement position P22 as the shutter 11 descends from the first descended position P11 to the second descended position P12. As a result, the first evacuation guidance display 31 changes from the first state to the second state, and the second evacuation guidance display 32 changes from the third state to the fourth state.

[0093] In the second and third embodiments, the first evacuation guidance sign 31 may be provided on the first surface 41 of the displacement member 40. In this case, when the shutter 11 descends to the first descended position P11, the first surface 41 of the displacement member 40 is exposed. This causes the first evacuation guidance sign 31 to assume a first state that is visible to evacuees.

[0094] In the second and third embodiments, when the shutter 11 is located in the original position, the displacement member 40 is located in the original position, but in this case, the displacement member 40 may be located inside the shutter 11 and wound up together with the shutter 11 onto the winding shaft 15. As a result, the tip portion 44 is sandwiched between the shutters 11.

[0095] 9(B), when the shutter 11 descends from the original position to the first lowered position P11, the displacement member 40 is displaced from the original position to the first displaced position P21, but the tip portion 44 is clamped between the shutter 11. Therefore, the tip portion 44 does not come off the shutter 11 and does not abut against the inner wall 14A. In other words, even when the displacement member 40 is disposed at the first displaced position P21, the tip portion 44 is disposed in the storage area 14 while being wound around the winding shaft 15. As a result, when the shutter 11 descends from the original position to the first lowered position P11, the shutter device 10 can set the first evacuation guidance sign 31 to the first configuration and the second evacuation guidance sign 32 to the third configuration, even if the tip portion 44 does not abut against the inner wall 14A.

[0096] Then, when the shutter 11 descends from the first descended position P11 to the second descended position P12, the tip 44 is no longer sandwiched between the shutters 11, and the displacement member 40 moves away from the shutter 11 and turns over, displacing from the first displacement position P21 to the second displacement position P22. As a result, the shutter device 10 can set the first evacuation guidance sign 31 to the second position and the second evacuation guidance sign 32 to the fourth position when the shutter 11 descends from the first descended position P11 to the second descended position P12.

[0097] In the second and third embodiments, the displacement member 40 having the first evacuation guidance sign 31 provided on the first surface 41 may be used as a display unit. The display unit is a unit that can be attached to the shutter 11.

[0098] In the second embodiment, the displacement member 40 having the second evacuation guidance display 32 provided on the second surface 42 may be used as a display unit. The display unit is a unit that can be attached to the shutter 11.

[0099] In the fourth embodiment, the condition for the shutter 11 to descend from the second descended position to the third descended position may be met when the temperature rises above a predetermined temperature, regardless of the elapsed time.

[0100] When a predetermined change condition is met, the control unit 20 may transmit a drive signal to the elevation drive unit 22 without transmitting a drive signal to the operation unit 21. The shutter device 10 does not have to include the operation unit 21.

[0101] The first fire detection unit 23 may be a sensor that detects the occurrence of a fire before the second fire detection unit 24 does, and does not have to be a sensor that detects smoke. The first fire detection unit 23 may be a sensor that detects the occurrence of a fire before the second fire detection unit 24 does, by being provided at a lower position than the second fire detection unit 24. The first fire detection unit 23 may be a sensor that detects the occurrence of a fire before the second fire detection unit 24 does, by being provided at a position closer to an area that may become the source of a fire than the second fire detection unit 24. The first fire detection unit 23 and the second fire detection unit 24 may be configured as an integrated fire detection unit.

[0102] A first evacuation guidance sign 31 may be provided on the second space 90B side. A second evacuation guidance sign 32 may be provided on the second space 90B side. In this case, the first fire detection unit 23 and the second fire detection unit 24 may be provided in the second space 90B.

[0103] The first evacuation guidance signs 31 may be provided on both the first space 90A side and the second space 90B side. The second evacuation guidance signs 32 may be provided on both the first space 90A side and the second space 90B side. In this case, the first fire detection unit 23 and the second fire detection unit 24 may be provided in both the first space 90A and the second space 90B.

[0104] The timing at which the first evacuation guidance display 31 changes from the first aspect to the second aspect may be any timing. As a specific example, in the first embodiment, the first evacuation guidance display 31 may change from the first aspect to the second aspect during the period from when the shutter 11 completes its descent to the first descent position P11 to when it starts its descent to the second descent position P12.

[0105] The first evacuation guidance display 31 may change from the first state to the second state when the shutter 11 starts to descend from the first descended position P11 to the second descended position P12. The first evacuation guidance display 31 may change from the first state to the second state during the period from when the shutter 11 starts to descend from the first descended position P11 to the second descended position P12 until the shutter 11 completes its descent.

[0106] The second evacuation guidance display 32 may change from the third aspect to the fourth aspect at any timing. As a specific example, in the first embodiment, the second evacuation guidance display 32 may change from the third aspect to the fourth aspect during the period from when the shutter 11 completes its descent to the first descent position P11 to when it starts its descent to the second descent position P12.

[0107] The second evacuation guidance display 32 may change from the third state to the fourth state when the shutter 11 starts to descend from the first descending position P11 to the second descending position P12. The second evacuation guidance display 32 may change from the third state to the fourth state during the period from when the shutter 11 starts to descend from the first descending position P11 to the second descending position P12 until the shutter 11 completes its descent.

[0108] The first evacuation guidance display 31 and the second evacuation guidance display 32 may include any image, such as a pictogram. The first evacuation guidance display 31 does not have to include an image indicating the evacuation direction in which evacuees should evacuate.

[0109] The second evacuation guidance sign 32 does not have to be provided on the shutter 11, and may be provided on, for example, the emergency door 95. In this case, the second evacuation guidance sign 32 may be a sign indicating that it is possible to pass through the emergency door 95.

[0110] The phrase "at least any" used herein means one or more of the desired options. As an example, when the number of options is two, the phrase "at least any" used herein means only one option or both options. As another example, when the number of options is three or more, the phrase "at least any" used herein means only one option or any combination of two or more options.

[0111] [Note] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (A) The shutter has a shutter surface, and the first evacuation guidance display is provided on a first shutter surface that is exposed when the shutter descends to the first descending position.

[0112] (B) The first evacuation guidance display includes an evacuation direction. (C) The displacement member is displaced in response to the descent of the shutter from the first descent position.

[0113] (D) The displacement member is bonded to the shutter, and the adhesive peels off depending on the temperature, causing displacement. (E) The first evacuation guidance sign is provided on a surface of the shutter or a first surface of the displacement member, and the second evacuation guidance sign is provided on a surface of the shutter or a second surface of the displacement member. [Explanation of symbols]

[0114] P11...first lowered position, P12...second lowered position, P21...first displacement position, P22...second displacement position, 10...shutter device, 11...shutter, 12...shutter surface, 12A...first shutter surface, 12B...second shutter surface, 20...control unit, 23...first fire detection unit, 24...second fire detection unit, 31...first evacuation guidance display, 32...second evacuation guidance display, 40...displacement member, 41...first surface, 42...second surface, 43...base end, 44...tip end.

Claims

1. a shutter that descends to a first descended position upon detection of a fire outbreak, and descends to a second descended position that is lower than the first descended position upon establishment of a predetermined change condition; A shutter device in which a first evacuation guidance display indicating that it is possible to pass under the shutter is in a first state that is visible to evacuees when the shutter descends to the first descended position, and changes to a second state that is more difficult for evacuees to see than the first state when the shutter descends to the second descended position.

2. The shutter device according to claim 1 , A shutter device in which a second evacuation guidance display indicating that passage beneath the shutter is impossible is in a third state in which evacuees are not visible when the shutter descends to the first descending position, and changes to a fourth state in which evacuees are visible when the shutter descends to the second descending position.

3. 3. The shutter device according to claim 1, the shutter descends from the first descended position to the second descended position when a predetermined temperature is reached as the predetermined change condition; The first evacuation guidance display changes from the first state to the second state when the temperature rises to a color-changing temperature that is equal to or lower than the predetermined temperature.

4. 3. The shutter device according to claim 1, the shutter has a displacement member, The shutter device, wherein the first evacuation guidance display changes from the first state to the second state by displacement of the displacement member when the predetermined change condition is met.

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